Configure yasnippet for RubyTapas; other RubyTapas updates.
Bind <f7> to compile
Add MELPA repo.
Install color-theme-mode
Disable fci-mode when exporting Org files.
Use rainbow-delimiters-mode when editing code.
Tweak current line highlight in RubyTapas color scheme.
Install multiple-cursor-mode
Install 'diminish' and update the diminished yasnippet appearance.